the factory battery for the d22 is only 68 Ah, definately upgrading is a good idea when the factory one dies,i went for the Bosch S4 12V 95Ah 830A. its the bosch reccomended from their online catalogue also. really worth the extra money in my opinion, just leave headlights or radio open all night long, without the engine run and it doesnt run out. factory one is not enough for me. i thinkit died in 3 years but i also have remote-central locking, alarm with motion detectors etc. price was 125 euro so ~187.07 Australian dollars?